Page 134 - สถิติทางวิทยาศาสตร์สุขภาพ เพื่อการวิจัย

„π°√≥’∑’˪√–™“°√∑—Èß 2 °≈ÿࡉ¡à‡ªìπÕ‘ √–µàÕ°—π
b
OR =
c
1 1
SE(ên OR) = +
b c

µ—«Õ¬à“ß∑’Ë 7.6

„π°“√»÷°…“°“√«‘®—¬‡™‘ß«‘‡§√“–Àå·∫∫¿“§µ—¥¢«“ß (cross-sectional analytical
study) ‡æ◊ËÕ¥Ÿ«à“¿“«–´÷¡‡»√â“¢ÕßÀ≠‘ß«—¬∑”ß“π¡’§«“¡ —¡æ—π∏å°—∫Õ“¬ÿÀ√◊Õ‰¡à ‚¥¬·∫àßÕ“¬ÿ
ÕÕ°‡ªìπ 2 °≈ÿà¡ §◊Õ °≈ÿà¡Õ“¬ÿ 20-40 ªï ·≈– 41-60 ªï º≈°“√ ”√«®· ¥ß„πµ“√“ß
µàÕ‰ªπ’È ®ß √ÿªº≈°“√»÷°…“

¿“«–´÷¡‡»√â“
°≈ÿà¡Õ“¬ÿ (ªï)
´÷¡‡»√â“ ª°µ‘ √«¡

41-60 15 65 80
20-40 5 115 120

√«¡ 20 180 200

§”π«≥§à“ OR „π°√≥’∑’˪√–™“°√∑—Èß 2 °≈ÿࡇªìπÕ‘ √–µàÕ°—π

ad 115 ¥ 15
OR = = = 5.3
bc 5 ¥ 65
®“°§à“ OR ∑’ˉ¥â· ¥ß«à“§à“ Odds ¢Õß¿“«–´÷¡‡»√â“¢ÕßÀ≠‘ß«—¬ 41-60 ªï

Ÿß‡ªìπ 5.3 ‡∑à“¢Õß°≈ÿà¡À≠‘ß«—¬ 20-40 ªï
°“√ª√–¡“≥§à“ OR ∑”‰¥â‚¥¬„™â Ÿµ√
ên[(1 - Ò) ™à«ß§«“¡‡™◊ËÕ¡—Ëπ¢Õß OR] = ên(OR) £ Z SE(ên OR)
a
2
π”¢âÕ¡Ÿ≈¡“§”π«≥§à“ 95% ™à«ß§«“¡‡™◊ËÕ¡—Ëπ¢Õß OR ‰¥â¥—ßπ’È

15 65 1 1 1 1
SE(ên OR) = + + +
5 115 a b c d

1 1 1 1
= + + +
15 65 5 115
= 0.539

7.3 °“√ª√–¡“≥§à“¢π“¥¢Õߧ«“¡ —¡æ—π∏å 133

∫∑∑’Ë 7 133 29/7/09, 4:13 PM